Reduction of NiO-WO<sub>3</sub> Oxide Mixtures Synthesized by Gel-Combustion Technique: A Route to Ni-W Alloys

A high performance NaxCoO2 cathode material for sodium ion batteries has been synthesized using a sol–gel combustion technique using glycine as a chelating agent.

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Sol-Gel Combustion Synthesis of Silica/ Carbon Black Pigment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.636 ◽

2012 ◽

Vol 554-556 ◽

pp. 636-639

Author(s):

Qi Fu Bao ◽

Wei Xia Dong ◽

Qi Bing Chang ◽

Jian Er Zhou

Keyword(s):

High Temperature ◽

Carbon Black ◽

Combustion Synthesis ◽

Raw Materials ◽

Sol Gel ◽

Black Pigment ◽

Prepared Sample ◽

Gel Combustion ◽

Combustion Technique

A green silicon-containing carbon black pigment was synthesized via a sol-geo combustion technique using TEOS and black ink as raw materials. The obtained black pigment was characterized by XRD, TEM and UV-vis absorption spectrophotometer. The results show that the silicon coated with carbon black pigment can be formed at pH ≥ 2 and the black pigment does not change its color after calcinations at 1300 °C in air implying the carbon black is coated completely with SiO2. When pH is 4, the properties of as-prepared sample are similar with the conventional high-temperature pigment. XRD and SEM further confirm that silicon coats with carbon black fully. The silica/ carbon black pigment may represent an opportunity for the applications in the decoration of the high-temperature ceramic.

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Structural, Morphological and Thermal Decomposition Studies of Calcium and Hafnium Modified BaTiO3 Electro Ceramics

10.21203/rs.3.rs-243264/v1 ◽

2021 ◽

Author(s):

Jude Fernandez ◽

B Bindhu ◽

M. Prabu ◽

KY Sandhya

Keyword(s):

Lead Zirconate Titanate ◽

Sol Gel ◽

Lead Zirconate ◽

Ferroelectric Material ◽

Tetragonal Symmetry ◽

X Ray Diffraction ◽

X Ray ◽

Gel Combustion ◽

Combustion Technique ◽

P4mm Space Group

Abstract Calcium and hafnium co-doped barium titanate could be used as a replacement for lead zirconate titanate, which is a lead-based ferroelectric material. Solid state reaction accompanied by the usual sintering technique is the classical ceramic-processing method, which demands a lot of time and effort. The present work aims to make the process a lot easier and quicker by employing a modified sol-gel combustion technique to synthesize polycrystalline Ba0.85Ca0.15Ti(1-x)HfxO3 (x=0.00, 0.05, 0.10, 0.15) electro ceramics . The molar ration is fixed at 1:1 for metal and citric acid at pH ~ 1. It was found that Ba0.85Ca0.15Ti(1-x)HfxO3 (where x=0.00, 0.05, 0.10, 0.15) crystallizes completely at around 1000 °C which is much lower than traditional methods. The structure supposedly displays a tetragonal symmetry with the P4mm space group as confirmed through x-ray diffraction (XRD) and Raman spectroscopy.

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Performance of Concrete with Waste Tyre and Nano ZrO2

Advanced Science Letters ◽

10.1166/asl.2018.12188 ◽

2018 ◽

Vol 24 (8) ◽

pp. 5737-5741

Author(s):

Sayandip Basak ◽

M. Helen Santhi ◽

Caroline Ponraj

Keyword(s):

Compressive Strength ◽

Average Crystallite Size ◽

Nano Particles ◽

Molar Ratio ◽

X Ray Diffraction ◽

Conventional Concrete ◽

Gel Combustion ◽

Microscope Imaging ◽

Electron Microscope Imaging ◽

Combustion Technique

This paper presents the compressive strength of concrete which consists of 5% replacement of coarse aggregate with rubber aggregate, 25% replacement of cement with fly ash (Class C) and an additional amount of 0.2% of ZrO2 nanoparticles. The ZrO2 nanoparticles were synthesized using gel combustion technique where zirconium oxynitrate was used as the precursor and citric acid as the fuel in the molar ratio of 1:1.5 respectively. The synthesized ZrO2 nano particles were characterized using X-ray diffraction and the average crystallite size was found as 9.7 nm. Three types of mixes were taken into consideration; control mix (M40), rubber modified concrete mix and nano-rubber modified mix. The Scanning Electron Microscope imaging was done to study the morphology of the mixes. With the percentage of rubber aggregate replacement mentioned above there was found to be a considerable decrease in the compressive strength but on incorporation of nano ZrO2 along with rubber aggregate it was found out that there was an increase in compressive strength which even surpassed the strength of conventional concrete.

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